package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        //查询数据库中是否已经存在需要添加的数据
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //如果已经存在，只需要将数量+1即可
        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);//获取原先数据
            shoppingCartMapper.updateNumberById(cart);
        }else {//如果不存在则插入
            //判断添加的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId!=null){
                //本次添加的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {
                //本次添加的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();

                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> listShoppingCart() {
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        return shoppingCartMapper.list(shoppingCart);
    }

    /**
     * 清空购物车
     */
    @Override
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    @Override
    public void deleteOneShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //查询数据库购物车中的数据
        //构造查询条件
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //查询数据库
        shoppingCart = shoppingCartMapper.list(shoppingCart).get(0);
        if (shoppingCart.getNumber()==1){//如果数量只有一份，则直接删除该条数据
            shoppingCartMapper.deleteOneShoppingCart(shoppingCart);
        }else{//否则只修改数量number=number-1
            shoppingCart.setNumber(shoppingCart.getNumber()-1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }
    }
}
